Centrifugal pump.



No. 841,643. PATENTED JAN, 15, 1907.

' J. DEGEN.

GENTRIFUGAL PUMP.

AIPLICATION FILED AUG,4,1906.

4 SHEBTS SHEET L WITNESSES /NVENTO/ No. 841,643. PATENTED JAN. 15, 1907. J DEGEN. CENTRIFUGAL PUMP.

APPLICATION FILED AUG.4,19()6v W! TNESSES Casi.

4 from/Us No. 841,643. PATENTED JAN. 15,1907.

J.3EGEN.-

GENTRIPUGAL PUMP.

APPLICATION FILED AUGA. 1906.

m 4 SHEETS-SHEET 3.

W/ T/VESSES No. 841,643. PATENTED JAN. 15, 1907/ J. DBGBN. O'BNTRIPUGAL PUMP.

APPLICATION FILED AUG.4.1906.

4 SHELSSHEET L.

WITNESSES INVENTUH A5741 0 2 1 BY y a I 4 M MWMWW number of impellers.

formed a series ol spiral ribs 13. start in a direction so that their surfaces 1 1,

*ivirnn s rains 'feafrisivr @FhftQE J LIUS DEGEN, F TRENTON, NEW JERSEY.

oeairsisueni. Puree.

, Specification of Letters Patent.

iatented Jan. 15, 1907.

Application filed August 4.1906. Serial lilo. 329.187-

To all whom it mmg concern."

Be it known that I, JULIUS DEGEN, of

'lrenton, in the county of Mercer, and in the State oi cw Jersey, have invented a certain new and useful Improvement in Centrifugal V lfumps; and I do hereby declare that the fol-' lowing is a full, clear, and exact description therepl, reference being had to the accom panying drawings in which-- ldig-ure 1 IS a central longltudinal seetwn oi e two-stae um) cmbod in m invention.

l i o igs. 2 and 3 are respectively'right and left end of the pump, the delivery-head being removed, this view being taken on the line 5 5 2 olwiiig. l.

The object of my invention has been to proyide a multista e centrifugal pump of high efiiciency in which thewater is trans- 'ierred from one impeller to the next impeller of the series in such a way that its velocity is transformed into the maximum amount of pressure; andto such ends my invention con-f sists in specified. Y .l

lncarrying my invention into practice I provide a casing which nithe illustrated cmthe centrifugal purn'p hereinslit'er bodiment of my invention consists of a suctron-head 1, an 1nterrned1ate section 2, and a delivery-head 0. 'Within the casing thus 'iorxned are two impellers 4 and 5, secured.

have illustrated the use of v upon'a shalt 6. 7 two-impellers, although my invention is applicable to a multistage-pump having any he water reaches the iirst impeller i by a suction-pipe 7, which pipe leads the water, as usual, toward the central portion of the impeller. The impeller has a series of blades 8, as usual, so that the rotation of the impeller will by centrifugal action throw the water out between the blades 8 at the exit 9 ol" the impeller.

in order to carry the water from the first impeller to the second impeller, a partition 10 is secured within the casing alongside of and overhanging the impeller, the front wall 11 of the partition and the rear wall 12 of the suction-head being in line with the side walls of the exit 9 of the impeller.

On the partition are cast or otherwise These ribs against which the'water strikes as it leaves The ribs 13 form between them passage Ways 16, which 1 tom; diilusing-nozzles, and which according to my invention very gradually increase in cross-section as they pass from .the impeller i to the impeller The inlet area of thenozzle, taken on the line 1717 of Fig. 4 is proportioned accord' e to the absolute outlet Velocity of the liquik' from the impeller 4, and the outlet area of the nozzle, taken on the line 18 18 of Fig. 5, is proportioned to the inlet velocity into the succeeding-impeller 5. From the entrance 17 to the exit 18 the area of cross-section'ot' the nozzle is gradually andcontinuously im creasing in such proportion that the velocity of the liquid is most eificiently transformed into pressure. The im eller 5 is constructed like the impeller 4:, an on the delivery side of the said impeller 5 a partition 19 is rovided, which partition is in all respects ike the partition 10 and which has ribs 20, which are like the ribs 13 and which form between them diffusing-nozzles like the passages 16. The ribs 20 convey the water to the outletpipe 2 1 While the operation'of my pump will be ap arent from the foregoing description, the fol owing brief summaryof it may be made: The water enters the suction-pipe 7 and is given a pressure and a high velocity by the rotation of the impeller 4 and by this action is delivered into the dii'l'usingmozzles. These nozzles gradually transform the velocity imparted by the i1npclh:r= .4 to pressure in the fluid and at the same tinie convey the fluid to the impeller 5 in such a? way that the least possible energy-is lost through eddy-currents senses have described, in passing from one impeller to the next, and at the same time gradually =decreasing its velocity, owing to the gradual j increasing area of the (llilUSlIlg-dlOZZlOS, I deliver the fluid at a pressure that is much 3 higher relatively than that of any other cen trifu ai-ptfmp with which I am familiar. l.

attribute the high ellicieney of my pump to next impeller and said nozzles gradually inthe combined action on the lluid of the long spiral path from one impeller to the next and the gradually-increasing area of the pas I sage-way or nozzle through which the fluid is transmitted.

It will be observed that I provide a long i passage-way that ver gradually increases in area, and thus transiorms the velocity into pressure without the formation of eddycurrents, and while I provide a long spiral path for the fluid I am enabled t o do this without materially increasing the diameter of the pump-casing, and therefore without greatly increasing the weight and cost of the pump. It will also be observed that the water is in the diffusing-nozzle all the time from its'exit of one impeller to its entrance to the next im eller.

elaim 1. In a centrifugal pump, the combination of a casing, an impeller and a series of difiusing-nozzles, said diflusing-nozzles extending from the exit of the impeller to a central delivery-opening in the casing, said nozzles bearea being substantially continuous to said.

delivery-opening.

ing of a spiral form, and also of a gradually increasing. area in a d1rect1on from the im- 4 peller to the delivery-opening said increase in 2. In a cen trilugal pump, the combination of a casing, a series 0 impellers in said casing, said casing having a series of di'll'using nozzles formed therein, said nozzles starting from the delivery of the first impeller in a direction tangent to the direction of the iluid in leaving tl.e impeller, said nozzles extend.- ing in a spiral direction to the entrance of the creasing in area from the first to the second impeller,so that the velocityol' the lluid is grad ually transformed into pressure.

3. In a centrifugal pump, the combination of a c: sing, a series of impellerstherein, a partition on the delivery side of the first impeller, spiral ribs between said partition and the casing, said ribs extending from a deliv 6c cry of the first impeller, in a direction tangent to the path of the fluid as it leaves the impeller, in a gradual spiral over said partition, and in toward the entrance of the second impeller, the passage-Way between said ribs gradually increasing in area from the first to the second impeller, whereby the velocity of the fluid-is transformed into pressure In testimonv have hereunto set my hand.

JULIUS DEGEN.

Witnesses:

- B. M. PHILLIPS,

ETREL S. BLACKBURN.

that I claim the foregoing I 7 I 

